Arbor for shell-tools.



MTNESSES E. O. PECK.

ARBOR FOR SHELL TOOLS.

APPLICATION FILED MAR. 10, 1906.

Patented Dec. 15, 1908.

2 SHBETSSHEET 1 IN HEM/TOP E. G. PECK.

ARBOR FOR SHELL TUOLS.

APPLIOATION FILED MAR.10, 1906.

906,656. Patented Dec. 15,1908.

2 SHEETS-SHEBT 2.

WE'JWES UNITED STATES PATENT OFFICE.

EUGENE C. PECK, OF CLEVELAND, OHIO, ASSIGNOR TO THE CLEVELAND TWISTDRILL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

ARBOR FOR SHELL-TOOLS.

Specification of Letters-Patent.

Application filed March 10, 1906.

To all whom it may concern:

Be it known that I, EUGENE C. PEoK, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful lm rovement in Arbors for Shell-Tools, of Whic the following is a full, clear, and exact description.

My invention relates to arbors. of that class having a stem providedwith a tapered exterior adapted to receive a cutter head or other shelltool having a tapered axial bore.

The invention more particularly relates to the provision of alongitudinally adjustable non-rotatable collar adapted to engage thetool, Without being secured thereto,so that variations in fit betweenthe tool and stem may be compensated.

The cutters used in connection with such arbors are of various sizes anddiameters and have tapered axial bores designed to pass over the taperedstem of the arbor until the tapered surfaces engage each otherand thewedging action is sufficient to retain the shell against longitudinalmovement. But inasmuch as the common method of preventing the rotationof the shell has been to provide the arbor shank with longitudinallypro'ecting fixed ribs and to form the cutter wit notches adapted to engae such fixed n'bs, there has been great (1 culty experienced in securingthe cutter properly upon the arbors. For example, when, by reason of thedistortion of the stem or the accumulation of dirt thereon, it is notpossible to advance the cutter so that the notches at the upper end comeinto full engagement with the fixed ribs, the cutter will, under strain,slip and rotate upon the stem of the arbor. Again, when the bore of thecutter is so large that the bottom of the notches or any part of theshell abuts against any fixed part of the shank, then, as will be plain,no wedging action takes place between the interior surface of the cutterand the exterior surface of the stem to hold the .cutter fixedly inosition. I am aware that it has been sought to avoid this trouble bydoing away with a tapered stem and using a cylindrical stem instead andemploying a non-rotatable collar having bayonet clutches adapted toengage cooperating notches on the upper part of the cutter shell. inthis prior structure the cutter is secured by the bayonet clutches tothe collar and is not longitudinally movable independent thereof afterit has once been placed in position. Such a structure is notsatisfactory for several reasons. Among others, the bore of the cuttermust fit very accurately to the stem, otherwise the loose-- ness of theparts will be sufficient to destroy the cutters efficiency. Furthermore,the cutter frequently becomes wedged upon the bayonet locks and itbecomes necessary to place the two in a clamp before the arts can edisengaged. l have, however, evised a structure in which engagementbetween the notches of the shell and the ribs holding the cutter againstrotation may be perfect notwithstanding the variations in fit betweenthe axial bore and the tapered stem, and further the loosening of theengaging elements may be efiected withput the use of addi tional tools.

Referring to the drawings, Figure 1 is an elevation of my im roved arborwithout the removable arts. ig. 2 is an elevation of the arbor with thelongitudinally adjustable collar and the adjusting nut thereon. Fig. 3is an elevation of the arbor with the adjusting nut and collar thereonand a cutter fixed on the tapered stem. Fig. 4 is a erspective view ofthe adjustable collar. ig. 5 is a perspective view of a modified form ofadjustable collar showing a different construction for preventingrotation of the collar upon the arbor. Fig. 6 is a cross section takenupon the line 6-6 of Fig. 3. Fig. 7 is an elevation, and Fig. 8 is asection on line 88 of Fig. 7 illustrating the modification shown in Fig.5.

In the structure which I have devised the arbor is screw threadedbetween the shank A and the ta ered stem A and adapted to receive an ajusting nut B thereon. In front of the adjusting nut I place alongitudinally adjustable collar B which is secured against rotation byany preferred means, such as a longitudinal feather B fitted to a grooveA in the shank, or b flat broad surfaces adapted to engage similarsurfaces upon the shank as shown in the modification in Fig. 5, or byany other convenient means. At the forward end of the adjustable collarare rojecting lugs or ribs B B desi ned to fit into notches O in theupper end 0 the ordinary cutter C.

By this structure it will be seen that the cutter C ma be moved over thetapered stem A unti it is firmly wedged thereon.

When it is firmly in position it is immaterial whether this position isa little in advance or behind the ordinary location for which it wasdesigned, as the adjusting collar may be either advanced or retractedcorrespondingly so as to cause a full engagement of the ribs with thenotches of the shell and yet avoid any abutment between the same whichwould prevent the proper wedging action taking place between the shelland the stem. Further, as will be evident, it is immaterial how tightlythe cutter may become wedged upon the stem during use, as it can bereadily detached by. hand through the simple rotation oi the adjustingnut, which, acting as a slow wedge, moves the adjusting collar forward,driving the shell ofi of the stem.

. Thus, it will be seen that l have provided an arbor having all of theadvantages of those hitherto known in the art, and in addition theretohaving an amount of adjustability coupled with closeness of fit and caacity for disengagement not hitherto possibl Having described Hiy-invention, I claim:

1. In combination, in an arbor, a tapered stem adapted to receive ashell tool, a non rotatable longitudinally movable member adaptedtoengage with said tool after the latter has been wedged on the stem andto hold'said tool against rotation, and means for forcing saidnon-rotatable member in the direction to loosen the tool from the arborstem.

2. in combination, a shell tool and an arbor, the arbor adapted toreceive the tool states and having a longitudinally movable memberdesigned to hold said tool against rotation, said tool and said memberbeing so constructed that positive engagement between them may beefiected by the longitudinal movement of said member.

3. In combination, in an arbor, a tapered stem adapted to receive ashell tool and a non-rotatable longitudinally movable member having asmooth surface adapted to he brought into engagement with acorresponding surface lying in a longitudinal plane on the tool by thelongitudinal movement of said member.

4. in combination, in an arbor, a tapered stem, a screw threadedportion, a nut upon saidthreaded portion and a non-rotatablelongitudinally movable member having means thereon adapted by alongitudinal movement thereof to engage a shell tool and hold the sameagainst rotation.

5. An arbor having a tapered end adapted to receive a tool and a screwthreaded portion, a nut on the threaded portion, a sleeve slidably butnon-rotatably mounted on said arbor and arranged to abut against one endof the nut, and means on the sleeve adapted. to interlock With the tool.

a in testimony whereof, I hereunto aflix my signature in the presence oftwo witnesses.

EUGENE (l PECK.

Witnesses:

J. M. Woonwann, E. B. Grronnrsr.

